Abstract
Abstract The field of optical stellar interferometry has seen tremendous growth in the past few years, as technology catches up with the requirements established by the science goals and the operating environment. Presently, several ground-based interferometers are in operation, and a number are in the development or planning stages. In addition, serious studies of space-based interferometers are in progress. The control challenges in optical interferometry on the ground pertain mostly to off setting the deleterious effects of the Earth's atmosphere—the fundamental limitation to ground-based astronomy—and to compensating for Earth rotation. In space, away from the atmosphere, in addition to the control challenges associated with large space structures, there are metrology challenges to enable high-accuracy astrome-try and imaging. The required level of metrology, ~10-100 picometers, pushes the current state of the art.
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